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Fermi Surface Nesting and Nanoscale Fluctuating Charge/Orbital Ordering in Colossal Magnetoresistive Oxides
Y.-D. Chuang,12A. D. Gromko,1D.
S. Dessau,1T. Kimura,3Y. Tokura34
We used high-resolution angle-resolved photoemission
spectroscopy to reveal the Fermi surface and key transport parametersof the metallic state of the layered colossal magnetoresistiveoxide
La1.2Sr1.8Mn2O7. With
these parameters, the calculated in-planeconductivity is nearly one
order of magnitude larger than themeasured direct current
conductivity. This discrepancy can beaccounted for by including the
pseudogap, which removes at least90% of the spectral weight at the
Fermi energy. Key to the pseudogapand to many other properties are the
parallel straight Fermi surfacesections, which are highly susceptible
to nesting instabilities.These nesting instabilities produce nanoscale
fluctuating charge/orbitalmodulations, which cooperate with
Jahn-Teller distortions andcompete with the electron itinerancy
favored by double exchange.
1 Department of Physics, University of
Colorado, Boulder, CO 80309-0390, USA.
2 Advanced
Light Source, Lawrence Berkeley National Laboratory, Berkeley,
CA 94720, USA.
3 Department of Applied
Physics, University of Tokyo, Tokyo 113, Japan.
4 Joint
Research Center for Atom Technology, Tsukuba 305-0046, Japan.
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[DOI: 10.1126/science.1061205] |Summary »|Full Text »
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